As one of the few people who have had both the Tanks, Inc and Specatra tanks in the same vehicle, I will highly recommend the Spectra. Better fitment, better access to hose lines, much more accurate fuel sender.
The Tanks sender is a Ford unit and will not go to full with a full tank.
Craig


2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado